Ore deposits of the French Massif Central: insight into the metallogenesis of the Variscan collision belt

Marignac, C.; Cuney, Michel

doi:10.1007/s001260050216

Cited by 146 publications

(69 citation statements)

References 10 publications

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“…Overall, the Paleozoic metallogenic history can be subdivided into three mineralizing epochs referred to as Eo-Variscan (Cambrian to Silurian), MesoVariscan (Devonian-early Carboniferous), and Neo-Variscan (late Carboniferous-Early Permian). This classification scheme is consistent with that proposed by Marignac and Cuney (1999) for ore deposits in the Massif Central of France. The Eo-Variscan epoch coincided with Early Cambrian rifting and includes host rocks to the newly delineated sediment-hosted stratiform copper province in the western and central Anti-Atlas that contains estimated total resources of >100 Mt of ore. Major deposits within this province are Jbel Laassel, Tizert, Jbel N'Zourk, Tazalaght, Agjgel, Jbel N'Zourk, and Amadouz.…”

Section: 18supporting

confidence: 68%

Geologic and Metallogenic Framework of North Africa

Bouabdellah

Slack

2016

Mineral Deposits of North Africa

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North Africa is noteworthy for having a great diversity of geology and mineral resources. Geologically, the region contains numerous terranes that contain rocks ranging in age from Archean to Quaternary, including diverse igneous, sedimentary, and metamorphic lithologies. Major geological features were built during the main phases of Proterozoic and subsequent Phanerozoic orogenies, the break-up of the supercontinents Rodinia, Gondwana, and Pangea, and during the opening and closing of major ocean basins such as the Iapatus, Atlantic, Pacific, and Tethys. Three major tectono-stratigraphic domains are recognized (1) the Precambrian province that includes the African-Nubian Shield (ANS) to the east and the West African Craton (WAC) to the west, and the intervening Tuareg Shield and "Saharan Metacraton"; (2) the Variscan (Paleozoic) fold belt; and (3) the Atlas-Alpine (Mesozoic-Cenozoic) system. Mineral deposits of North Africa formed in a variety of geologic settings at different time periods from Archean to Quaternary. Mineral commodities including gold, silver, cobalt, nickel, chromium, arsenic, copper, lead, zinc, iron, and many other elements. Major deposit types present in the region are (1) orthomagmatic Cr-Ni-platinum group elements (PGE); (2) rare-metal granites and related rare-element pegmatites; (3) volcanic-hosted massive sulphide (VHMS); (4) sedimentaryexhalative (SEDEX); (5) orogenic and intrusion-related gold; (6) iron oxide-copper-gold (IOCG); (7) banded iron formation (BIF); (8) Mississippi Valley-type (MVT) lead-zinc; (9) sediment-hosted stratiform copper;Electronic supplementary material The online version of this chapter

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Section: 18supporting

confidence: 68%

Geologic and Metallogenic Framework of North Africa

Bouabdellah

Slack

2016

Mineral Deposits of North Africa

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“…The available geotectonic data suggest that the lode gold deposits at Pataz formed in a situation equivalent to the SaintYrieix deposits, where the mineralization occurred during the final exhumation of the Variscan orogenic belt, associated with erosion and development of intracontinental coal basins (Bouchot et al, , 2000Marignac and Cuney, 1999). Moreover, the ages of the geologic events in the Pataz region are noticeably similar to the ones obtained in the French Massif Central.…”

Section: Comparison With Other Orogenic Gold Depositssupporting

confidence: 58%

Carboniferous Orogenic Gold Deposits at Pataz, Eastern AndeanCordillera, Peru: Geological and Structural Framework, Paragenesis, Alteration,and 40Ar/39Ar Geochronology

et al. 2004

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“…These deposits formed during Carboniferous to Permian times between 330 Ma and 280 Ma in relation to the lateVariscan orogenic evolution [6][7][8][9][10]. In France, the Beauvoir granite represents one of the best examples of a PHP-RMG with a disseminated Sn-Li-Ta-Nb-Be mineralization [5] and was intensively studied during the 1980s-1990s, with the 900 m of continuous core drilling GPF1 from the "Géologie Profonde de la France" program [11].…”

Section: Introductionmentioning

confidence: 99%

Geochemical Signature of Magmatic-Hydrothermal Fluids Exsolved from the Beauvoir Rare-Metal Granite (Massif Central, France): Insights from LA-ICPMS Analysis of Primary Fluid Inclusions

et al. 2017

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The Beauvoir granite (Massif Central, France) represents an exceptional case in the European Variscan belt of a peraluminous raremetal granite crosscutting an early W stockwork. The latter was strongly overprinted by rare-metal magmatic-hydrothermal fluids derived from the Beauvoir granite, resulting in a massive topazification of the quartz-ferberite vein system. This work presents a complete study of primary fluid inclusions hosted in quartz and topaz from the Beauvoir granite and the metasomatized stockwork, in order to characterize the geochemical composition of the magmatic fluids exsolved during the crystallization of this evolved rare-metal peraluminous granite. Microthermometric and Raman spectrometry data show that the earliest fluid (L1) is of high temperature (500 to >600 ∘ C), high salinity (17-28 wt.% NaCl eq), and Li-rich ( e < −70 ∘ C) with Na/Li ratios ∼5. LA-ICPMS analyses of L1-type fluid inclusions reveal that the chemical composition of this magmatic-hydrothermal fluid is dominated by Na, K, Cs, and Rb, with significant concentrations (10 1 -10 4 ppm) in rare-metals (W, Nb, Ta, Sn, and Li). This study demonstrates that primary fluid inclusions preserved the pristine signature of the magmatic-hydrothermal fluids in the Beauvoir granite but also in the metasomatized W stockwork, despite the distance from the granitic cupola (>100 m) and interaction with external fluids.

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Ore deposits of the French Massif Central: insight into the metallogenesis of the Variscan collision belt

Cited by 146 publications

References 10 publications

Geologic and Metallogenic Framework of North Africa

Geologic and Metallogenic Framework of North Africa

Carboniferous Orogenic Gold Deposits at Pataz, Eastern AndeanCordillera, Peru: Geological and Structural Framework, Paragenesis, Alteration,and 40Ar/39Ar Geochronology

Geochemical Signature of Magmatic-Hydrothermal Fluids Exsolved from the Beauvoir Rare-Metal Granite (Massif Central, France): Insights from LA-ICPMS Analysis of Primary Fluid Inclusions

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